audio: Implement a SDL2 backend (#2258)

* audio: Implement a SDL2 backend

This adds support to SDL2 as an audio backend.
It has the same compatibility level as OpenAL without its issues.

I also took the liberty of restructuring the SDL2 code to have one
shared project between audio and input.

The configuration version was also incremented.

* Address gdkchan's comments

* Fix update logic

* Add an heuristic to pick the correct target sample count wanted by the game

* Address gdkchan's comments

* Address Ac_k's comments

* Fix audren output

* Address gdkchan's comments

1 files changed, 8 insertions, 1 deletions

diff --git a/Ryujinx.Audio/Backends/Common/HardwareDeviceSessionOutputBase.cs b/Ryujinx.Audio/Backends/Common/HardwareDeviceSessionOutputBase.cs
index 1e000e4c..f1f0039c 100644
--- a/Ryujinx.Audio/Backends/Common/HardwareDeviceSessionOutputBase.cs
+++ b/Ryujinx.Audio/Backends/Common/HardwareDeviceSessionOutputBase.cs
@@ -18,6 +18,7 @@
 using Ryujinx.Audio.Common;
 using Ryujinx.Audio.Integration;
 using Ryujinx.Memory;
+using System.Runtime.CompilerServices;
 
 namespace Ryujinx.Audio.Backends.Common
 {
@@ -52,7 +53,13 @@ namespace Ryujinx.Audio.Backends.Common
 
         protected ulong GetSampleCount(AudioBuffer buffer)
         {
-            return (ulong)BackendHelper.GetSampleCount(RequestedSampleFormat, (int)RequestedChannelCount, (int)buffer.DataSize);
+            return GetSampleCount((int)buffer.DataSize);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        protected ulong GetSampleCount(int dataSize)
+        {
+            return (ulong)BackendHelper.GetSampleCount(RequestedSampleFormat, (int)RequestedChannelCount, dataSize);
         }
 
         public abstract void Dispose();